( Reaffirmed 2000 ) IS : 9316 ( Part 5 ) - 1988 lndian Standard METHODS OF TEST FOR RUBBER LATEX PART 5 DRAWING OF SAMPLES RL : 5 ( 0. First Revision ) FOREWORD 0.1 This Indian Standard (Part 5 ) (First Revision) was adopted by the Bureau of Indian Standards on 14 March 1988, after the draft finalized by the Rubber Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council. 0.2 Test methods for rubber fol'owing Indian Standards: latex had been originally covered in the a) For natural rubber latex IS : 3708 (Part IS,: 3708 (Part 1 )-1966* 2)-1968t b) For styrene butadiene rubber latex IS : 4511 ( Part 1 )-1967: 0.2.1 Since some of the test methods covered in above standards were common, the concerned Committee had decided some years ago to unify and publish a separate series of methods of test which would be applicable to all types of latices-natural as well as synthetic. *Methods of test for natural rubber latex: Part 1 Dry rubber content, sludge content, density, total alkalinity, KOH-number, mechanical stability, volatile fatty acid number, pH, total nitrogen, total copper, total iron, total manganese and total ash. $Methods of test for natural rubber latex, Part 2. iMethods of test for styrere-butadienc rubber ( SBR ) laticos: Part 1 Determination of dry polymer, bH, density, residual styrenc, bound styrene and soap content. . I -IS : 9316 ( Part 5 ) - 1988 Accordingly, IS : 9316*: Part Part Part Part Part Part the following six test methods had been covered under l-1979 2- 1979 3-1979 4-l 979 5-1979 6-1982 Determination Determination Determination Determination Drawing of surface of viscosity tension of coagulum of total content solids content of samples of PH Determination 0.2.2 As a result of further rethinking on the subject, it has now been decided to re-designate the test methods common to natural and synthetic rubber latices as RL series; test methods for natural rubber latex as NRL series and test methods for styrene-butadiene rubber latex as SBRL series. Consequently, test methods for rubber latex have been rationalized into the following three series: a) IS : 9316 b) IS : 3708 c) IS : 4511 Unified methods of test applicable to both natural and synthetic rubber latices - RL series, Methods of latex--NRL Methods rubber test applicable series, and to natural rubher of test applicable to latex - SBRL series. styrene-butadiene 0.3 The existing Indian Standards under IS : 3708 (Part 1 )t and 1 to S)? are being ( Part 2 )$, IS : 4511 ( Part 1 )§ and IS : 9316 (Parts gradually replaced by separate standards under the above three series, designated by the appropriate NRL, SBRL, or RL series, respectively. 0.3.1 The methods covered under NRL : 13, NRL : 14 and NRL : 15 of IS : 3708 (Part 1 )-1966t are now being covered under the RL series in IS : 9316 (under-print). *Methods of test for rubber latex. tMethods of test for natural rubber latex: Part 1 Dry rubber content, sludge content, KOH-number, mechanical stability, volatile fatty acid density, total alkalinity, number, pH, total nitrogen, total copper, total iron, total manganese and total.ash. $Methods of test for natural rubber latex, Part 2. fMethods of test for styrene butadiene rubber ( SBR ) latices: Part 1 Determination of dry polymer, pH. density, :wdual styrene, bound styrene and soap content. 2 IS : 9316 ( Part 5 ) - 1988 0.4 In order to facilitate cross-reference, it has been decided to retain the original discrete NRL, SBRL and RL series numbers assigned to various test methods, in IS : 3708 ( Part 1 )* and (Part 2)t, IS : 4511 ( Part 1 )$ and IS : 9316 ( Parts 1 to 6 )§ in the revised parts of IS : 3708, IS : 4511 and IS : 9316 respectively. 0.4.1 For proper referencing of the existing test methods and the a statement showing corresponding new methods under revision, methods is given in Appendix A. 0.5 The method for drawing of samples as given in the original standard published in 1979 has been revised to give more precise definitions, the apparatus in more detail and it further clarifies some The method of homogenizing latex ambiguity on preliminary testing. in drums fitted with bungs has been altered, and in order to safeguard against stratification, closer agreement in total solids content is required between samples drawn from different levels. 0.6 In preparing the above series, the need to align the test methods with the corresponding IS0 Standards DIS/DP, wherever available, has also been taken into account for updating the test methods. In the preparation of this standard, assistance has been derived from IS0 123-1985 `Rubber latex-sampling', issued by the International Organization for Standardization ( 1SO ). 0.7 In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960~1~~. 1. SCOPE 1.1 This standard ( Part 5 ) prescribes procedures for natural rubber latex concentrate containing preservative also for the sampling of synthetic rubber latices. 1.2 This standard is suitable for the sampling contained in drums, tank cars, or tanks. of rubber sampling of agents and latex that is *Methods of test for natural rubber latex: Part 1 Dry rubber content, sludge content, total alkalinity, KOH-number mechanical stability, volatile fatty acid density, number, pH, total nitrogen, total copper, total iron, total manganese and total ash. tMethods of test for natural rubber latex, Part 2. $Methodr of test for styrene butadicne rubber (SBR) la&es: Part 1 Determination of dry polymer, pH, density, residual styrene, bound rtyrene and soap content. IMethods of teat for rubber latex. l/l/Ruler for rounding off numerical valuer ( rrvistd). 3 IS : 9316 ( Part 5 ) - 1988 2. TERMINOLOGY 2.0 For apply * the purpose of this standard, the following definitions shall definite quantity of latex processed or produced under 2.1' Lot -A conditions which are presumed uniform? from which test sample is required. The lot may be in one or more containers or vessels, for example, it may consist of several drums of the same latex. 2.2 Sample - Any quantity of latex that is drawn from the lot. - A quantity of latex intended for laboratory 2.3 Laboratory Sample inspection and testing and that is representative of the lot. 2.4 Test Sample obtained by filtering of coagulum content. A quantity of latex that the laboratory sample. is suitable for tesCng NOTE- The laboratory sample, and not the test sample, is used for detvrmination 3. OUTLINE OF THE METHOD bulk. The 3.1 The latex is agitated thoroughly to obtain a homogeneous A representative sample ( 2.3) is taken from the bulk of the latex. test sample ( 2.4) is prepared from the lab,)ratory sample 2.3. 4. APPARATUS homogenization of latex in drums. For open-headed 4.1 Stirrer -For drums, use either 4.1.1 or 4.1.2. For drums fitted with a bung, use 4.1.3. 4.1.1 Perforated Stainless Steel Disc Plunger - of diameter 150 mm, with holes of diameter approximately 10 mm. approximately frequency of 100 to 700 4.1.2 Motor Driven Stirrer - with a rotational A suitable type of stirrer consists of a collapsible two-bladed rev/min. stainless steel propeller of 110 mm minimum diameter when fully opened, mounted on a stainless steel' shaft sufficiently long for the propeller to be at a distance of about one-tenth the height of latex If desired, two propellers may be used from the bottom of the drum. on the same shaft, in which case the lower one shall meet the foregoing The shaft speed shall give a brisk requirements as regards position. turnover without creating a vortex. The part of the equipment immersed in the latex shall not contain copper. 4.1.3 Motor approximately Driven Drum 10 rev/min. Roller capable of rotating a drum at 4 IS : 9316 ( Part 5 j - 1988 4.2 Sampling Tubes for Latex in Drums - Use either 4.2.1 or 4.2.2. length at the tube 4.2.1 Glass Tube - of internal diameter 10 to 15 mm and least 1 m, open at both ends and having a stopper for closing while withdrawing the latex. 4.2.2 Stainless Steel Sampling Tube - of internal diameter approximately 25 mm and length at least 1 m, the bottom of which can be opened or closed by remote control. An outline drawing of a suitable design is 1 given in Fig. 1. HANDLE SPRING GUIDES VALVE FOR ROD FIG. 1 SAMPLING TUBE FOR DRUMS, TANK AND SMALLER TANKS CARS IS : 9316 ( Part 5 ) - 1988 4.3 Sampling Devices for Latex in Tank Cars or Tanks Use 4.3.1 for sampling latex, the depth of which is 3 m or more. Use either 4.3.2 or 4.3.1 for sampling latex, the depth of which is less than 3 m. of a weighed cylindrical, stainless 4.3.1 Sampling Vessel - Consisting steel vessel of capacity approximately one litre, closed by bung that The weight of the vessel shall be can be removed by remote control. sufficient to ensure that when empty and closed, it will sink freely through the latex. To the top of the cylinder there are attached, to at least two points, strong cords of material inert to the latex, of length greater than the depth of the latex that is to be sampled. diameter 25 mm and 4.3.2 Stainless Steel Sampling Tube - of internal length 3 m, the bottom of which can be opened or closed by remote An outline drawing of suitable design is given in Fig 1. control. capacity 2 litres, for reception of latex from sampling 4.4 Beakers -of tube or sampling vessel. The beaker(s) shall be shock-resistant and have a smooth inner surface that is chemically resistant to latex. 4.5 Sample Bottles--of capacity 1 litre, with screw caps. The bottles shall have a smooth inner surface and be composed of an Glass impermeable material that is chemically resistant to the latex. Tlun or flexible pIas ic or some types of plastics are suitable materials. containers shall not be used. 4.6 Stainless Steel Wire of180flO~m[seeIS:460(Part 5. SAMPLING 5.0 At all stages of sampling, prevent the introduction latex and keep exposure of latex to air to a minimum. 5.1 Preliminary Examination - Examine presence of gross coagulum, skin, and foreign 5.2 Sampling From Drums -Homogenize whichever the latex is appropriate, manually as specified or mechanically as the latex matter. of air into the ClothWith an average l)-1985*]. aperture width visually for the 5.2.1 Homogenization in 5.2.1.1 or 5.2.1.2, specified in 5.2.1.3. *Specification for test sieves: Part 1 Wire cloth test sieves (third revision ). 6 IS : 9316 ( Part 5 ) - 1988 5.2.1.1 If the drum is fitted with a bung and manual or mechanical homogenization of the latex cannot be achieved; place the drum on a and roll for 24 h at about 10 rev/min. drum roller (4.1.3) 5.2.1.2 If the drum is of the open-head type, remove the end head and stir the contents thoroughly for at least 10 min, preferably by means of the perforated stainless steel disc plunger ( 4.1.1). 5.2.1.3 Agitate the contents of the drum by means of the motorAvoid driven stirrer (4.1.2) for 10 min to homogenize the latex. excessive stirring. 5.2.2 Taking of Laboratory Sample - After homogenization of the latex, take the laboratory sample without delay using the glass tube ( 4.2.1) or the stainless steel sampling tube ( 4.2.2 ). 5.2.2.1 In the case of glass tube, ensure that it is clean and dry Then and slowly insert it in the drum until it reaches the bottom. close the upper end of the tube with the stopper, withdraw it and Repeat the transfer its contents to a clean, dry sample bottle ( 4.5). operation until sufficient latex has been obtained to fill the sample bottle, leaving an air space of 2 to 5 percent to allow for thermal Screw the cap firmly on the bottle. expension. 5.2.2.2 In the case of stainless steel sampling tube, slowly insert it the drum, holding the bottom of the tube open, until it reaches the bottom. Then release the handle to close the bottom of the tube, and withdraw the tube. Transfer the contents of the tube into a beaker Repeat the operation until sufficient ( 4.4 ) by depressing the handle. latex has been obtained. Transfer the latex from the beaker to a clean, dry sample bottle (4.5), leaving an air space of 2 to 5 percent and screw the cap firmly on the bottle. 5.2.3 Sampling from Several DrumsWhere sampling of same latex for example 10 percent sample of a from several drums is required, latex, the amount of latex drawn from each drum may be reduced Combine and stir the individual samples and bottle proportionately. the resultant laboratory sample. 5.3 Sampling from Tank Cars and Tanks in 5.3.1 Sampling Operation - Use the sampling vessel ( 4.3.1) or sampling Operate the sampling vessel tube ( 4.3.2 ), whichever is appropriate. by lowering it, with the bung in place, into the latex to the required depth and then pulling out the bung. Allow a few seconds for the vessel to fill with latex and then pull it up and transfer its contents to a beaker. Transfer the latex to the sample bottle, leaving an air 7 IS : 9316 ( Part 5 ) - 1988 space of 2 to 5 percent ( to allow for thermal expansion) and screw the cap firmly on the bottle. Operate the sampling tube by inserting it, with the bottom closed, into the latex to the required depth and then, After by depressing the handle, and opening the bottom of the tube. the tube has filled with latex, release the handle to close the bottom and withdraw the tube. Transfer the contents of the tube into a beaker and transfer the latex to the sample bottle, leaving an air space Screw the cap firmly on the bottle. of 2 to 5 percent. 5.3.2 Testing for Homogenei& - Take separate samples, 100 mm from Determine the top surface and 100 mm from the bottom of the latex. ;~",g~tal solids content by the method specified in IS : 9316 ( Part 4 ). If the results from the top and bottom samples do not agree within 0'5 percent ( m/m) total solids, thoroughly rehomogenize the complete lot until samples obtained do agree within this tolerance. NOTE - Thorough agitation can be achieved with an efficient stirrer or by pumping the latex around or into another container. mechanical the degree of homogeneity 5.3.3 raking of Laboratory Sample -After specified in 5.3.2 has been achieved, take three samples of similar volume, the first half-way between the top and the centre of the latex, the second at the centre of the latex, and the third half-way between Combine and stir the three the centre and the bottom of the latex. samples and transfer the resultant laboratory sample to a sample bottle. NATE 1 -If the sampling tube is used, a single sample may be taken by inserting the tube, with the bottom held open, to the bottom of the latex and then closing the bottom of the tube before wrthdrawing it from the latex. NOTE, 2 - Coagulum content is determined on laboratory sample and not on test sample. 5.4 Preparation of Test Sample - Stir the laboratory sample Transfer carefully and filter it through the stainless steel wire cloth. the filtered latex to another sample bottle, leaving. an air space of 2 to 5 percent and screw the cap firmly on the bottle. 6. LABELLING THE TEST OF LABORATORY SAMPLE shall be labelled SAMPLE AND shall contain: 6.1 These samples and the lable a) A description of the material; letex: Part 4 Determination of total so!ids content *Methods of test for rubber ( jirst revisien) . IS : 9316 ( Part 5 ) - 1988 b) 4 4 e) f> Size and particulars ship, barrel, drum ); Designation Consigner; Place Date of sampling; of sampling; and ef consignment number ( tank-wagon, tank, and reference of the sample; 9) Name 7. TEST of the sampler. REPORT shall include the following information: 7.1 The test report A a> referance to this standard; necessary for identification of test sample; b) 4 4 4 f) All details Frequency of sampling; A record,of creaming, visible gross coagulum, skin and foreign matter ( if any ) present in the original container; Any unusual Any operation optional. features not noted included during the sampling; and or regarded as in this standard APPENDIX ( Cfause 0.4. I ) A TABLE SHOWING CORRESPONDENCE OF VARIOUS METHODS OF TEST COVERED IN THE EXISTING IS : 9316 ( PARTS 1 TO 5 )-1979, IS : 9316 ( PART 6)-1982, IS : 3768 ( PART 1 )-1966, IS : 3798 ( PART 2 )-1968, IS : 4511 ( PART l )-1967 WITH THE REVISION/PROPOSED REVISION OF IS : 9316, IS : 3708 AND IS : 4511 EXIETINQ ----_---___, ; ! CR REMARKS 7 TE~T METHODS ---h-----~------_-_ PBOPO8ED ---------- REVISION --- Test Method (1) RL Series Determination of rurface tension Determination of viscosity Determination of coagulum content Determination of total solids content Drawing of samples Determination ol pH Determination of total copper Determination of total iron Detc rminatlon of total manganese NRL Srrirs Determination content Determination Determination Determination of dry rubber IS No. Part ( Scrip ) (3)' ' r IS No. (4) Part ( Series) (5) ' (6) CI f (2) i; IS : 9316-1979 IS : 9316-19i9 IS : 9316-1979 IS Part 1 Part 2 Part 3 Part 4 Part Part Part Parr Part 5 6 1 NRL 1 NRL 1 NRL IS: 9316 (Part 1 )-I987 IS : 9316 ( Part 2 )-1987 IS : 9316 (Part 3)-1987 IS : 9316 ( Part 4)-1988 1s : 9316 CS : 9316 IS : 9316 IS : 9316 IS : 9316 ( Part ( Part ( Part (Part ( Part 5 )-I988 6)-1988 7 )-I987 8)-1987 9)-1987 (RL: 1) : 9316-1979 (RL:4) (RL:5) (RL:6) IS : 9316-1979 IS: 9316-1982 IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 : 13 ) : 14) : 15) IS :3708-1966 IS : 3708-1966 IS : 3708-1966 IS : 3708-1966 Part I (NRL : 1) IS : 3708 ( Part 1 )-1985 (NRL: (NRL:5) (NRL:6) (NRL: 1) of sludge content of density of total alkalinity Parr I NRL:5) Part I NRL:6) Part 1 NRL : 7 ) IS : 3708 ( Part 2 )-I!)85 IS : 3508 ( Part 3 )-I985 IS : 3iO8 ( Part 4 )-1985 7) Determination Determination stability Determination acid number Determination Determination Determination Determination of KOH-number of mechanical of volatile of of of of fatty IS : 3708-1966 IS : 3708-1966 IS : 37u8-1966 IS : 3708-1966 IS : 3708-1966 IS : 3708-1968 IS : 3708-1968 Part 1 (NRL Part l(NRL:9) Part 1 (NRL :8) : 10) IS IS Is : 3708 ( Part 5)-1985 : 3708 ( Part 6 ) -1985 : 3708 ( Part 7 )-I986 ( Part ( Part ( Part ( Part 8 )-1986 9)-1986 IO)-1986 11 )-1986 (NRL: 8) (NRL:S) (NRL: 10) total nitrogen total ash boric acid magnesium Part 1 (NRL : 12 ) Part1 (NRL:l6) Part 2 ( NRL : 17 ) Part2 (NRL: 18) IS : 3708 IS : 3708 IS : 3708 IS : 3708 (NRL:l2) (NRL:l6) ( NRL : 17 ) ( NRL : 18 ) SBRL Se&r Determination of dry polymer Determination of defnrity Determination volatile unsaturates Determination of bound otyrene Determination of soap content Determination of high-speed mechanical stability IS IS IS IS IS : 4511-1967 : 4511-1967 : 4511-1967 : 451 I-1967 : 451 I-1967 - Part 1 (SBRL:l) Part l(SBRL:6) Partl(SBRL:8) IS : 4511 ( Part 1 )-I986 1S : 4511 ( Part 2)-1986 IS : 4511 ( Part 3 )-I987 (SBRL: (SBRL: (SBRL: 1) 6) 8) IS : 4511 ( Part 4)-1986 Part 1 (SBRL:9) Part 1 ( SBRL : 10 ) .IS:4511 (Parts)-1986 IS : 4511 ( Part 6 )-I987 (SBRL:S) (SBRL: IO) (SBRL: II) =: INTERNATIONAL Base Units QUANTITY Length Mass Time Electric current Thermodynamic temperature Luminous intensity Amount of substance Supplementary QUANTITY Plane angle Solid angle Derived Units QUANTITY SYSTEM OF ,UNITS ( SI UNITS ) UNIT metre kilogram second ampere kelvin candela mole UNIT radian steradian UNIT newton joule watt weber tesla hertz riemens volt pascal SYMBOL m kg s A Ii cd ITlO , Units SYMBOL rad sr SYVBOL N 1N = Force Energy Power Flux Flux density Frequency Electric conductance Electromotive force Pressure, stress 1 kg.m/s' 1 N.m J W Wb T HZ s V Pa 1J = 1W - 1 J/s 1 Wb= 1 V.s 1T - 1 Wb/m' 1 Hz = 1 c/s (s-l) 1 s = 1 A/V IV = 1 W/A I Pa = 1 N/m'